Whoa! Where does the 60 minute water duration come from? It's not brought in from #13 on that short list that I see. So you need the appropriate density for the 13R water supply duration- Don't need no stinkin hose allowance in 13R And you may be able to call the storage area OH 1 and .15.
George L. Church, Jr., CET Rowe Sprinkler Systems, Inc. PO Box 407, Middleburg, PA 17842 877-324-ROWE 570-837-6335 fax [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Mark Sornsin Sent: Monday, June 06, 2011 4:31 PM To: [email protected] Subject: RE: Attic storage design on a 13R system Joel: It appears the first caveat is the biggest as far as reducing demand. Is the attic going to be 500 sq.ft. or less, or will it be subdivided that way? If so it appears you can have 4 heads at 0.2 density. At 60 minutes that should keep you below 7,500 gallons, depending on the efficiency of the system (lack of overage). Mark A. Sornsin, PE| Fire Protection Engineer Ulteig Engineers, Inc.| Fargo, ND [email protected] -----Original Message----- From: [email protected] [mailto:[email protected]] On Behalf Of Joel Chaim Sent: Monday, June 06, 2011 11:56 AM To: [email protected] Subject: Attic storage design on a 13R system I have a small building that's 3000 sq. feet designed as per NFPA 13R. but they want to use the attic for a storage room and the water supply is a tank and they need more water because the storage classification brings it up to 60 min. My question is does this section of the code do any good and reduce the water duration requirement? 6.7.2.2 The system demand of areas outside the dwelling unit shall be permitted to be limited to the number of sprinklers in the compartmented area but shall not be greater than the demand for a total of four sprinklers where all of the following conditions are met: (1) The area is compartmented into areas of 500 ft2 (46 m2) or less by 30-minute fire-rated construction. (2) The area is protected by quick-response or residential sprinklers not exceeding 130 ft2 (12 m2) per sprinkler for ordinary hazard, 225 ft2 (20.9 m2) for light hazard, or the allowable coverage of the sprinkler listing. (3) Openings have a lintel at least 8 in. (203 mm) in depth. (4) The total area of openings does not exceed 50 ft2 (4.6 m2) for each compartment. (5) Discharge densities are in accordance with NFPA 13, Standard for the Installation of Sprinkler Systems. _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field) _______________________________________________ Sprinklerforum mailing list [email protected] http://fireball.firesprinkler.org/mailman/listinfo/sprinklerforum For Technical Assistance, send an email to: [email protected] To Unsubscribe, send an email to:[email protected] (Put the word unsubscribe in the subject field)
